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Ultrafast Dynamics of Charge Density Waves in 4H<sub>b</sub>−TaSe<sub>2</sub> Probed by Femtosecond Electron Diffraction

Ultrafast Dynamics of Charge Density Waves in 4Hb−TaSe2 Probed by Femtosecond Electron Diffraction

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ERASMUS, Nicolas, Maximilian EICHBERGER, Kerstin HAUPT, Ilana BOSHOFF, Günther KASSIER, Reinhard BIRMURSKE, Helmuth BERGER, Jure DEMSAR, Heinrich SCHWOERER, 2012. Ultrafast Dynamics of Charge Density Waves in 4Hb−TaSe2 Probed by Femtosecond Electron Diffraction. In: Physical Review Letters. American Physical Society (APS). 109(16), 167402. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.109.167402

@article{Erasmus2012-10-19Ultra-49288, title={Ultrafast Dynamics of Charge Density Waves in 4Hb−TaSe2 Probed by Femtosecond Electron Diffraction}, year={2012}, doi={10.1103/PhysRevLett.109.167402}, number={16}, volume={109}, issn={0031-9007}, journal={Physical Review Letters}, author={Erasmus, Nicolas and Eichberger, Maximilian and Haupt, Kerstin and Boshoff, Ilana and Kassier, Günther and Birmurske, Reinhard and Berger, Helmuth and Demsar, Jure and Schwoerer, Heinrich}, note={Article Number: 167402} }

Demsar, Jure Erasmus, Nicolas Boshoff, Ilana Haupt, Kerstin 2012-10-19 Kassier, Günther Boshoff, Ilana 2020-04-24T09:33:34Z Birmurske, Reinhard Demsar, Jure Haupt, Kerstin Eichberger, Maximilian The dynamics of the photoinduced commensurate-to-incommensurate charge density wave (CDW) phase transition in 4H<sub>b</sub>−TaSe<sub>2</sub> are investigated by femtosecond electron diffraction. In the perturbative regime, the CDW re-forms on a 150-ps time scale, which is two orders of magnitude slower than in other transition-metal dichalcogenides. We attribute this to a weak coupling between the CDW carrying T layers and thus demonstrate the importance of three-dimensionality for the existence of CDWs. With increasing optical excitation, the phase transition is achieved, showing a second-order character, in contrast to the first-order behavior in thermal equilibrium. Berger, Helmuth Kassier, Günther Ultrafast Dynamics of Charge Density Waves in 4H<sub>b</sub>−TaSe<sub>2</sub> Probed by Femtosecond Electron Diffraction Schwoerer, Heinrich eng Schwoerer, Heinrich Berger, Helmuth Eichberger, Maximilian 2020-04-24T09:33:34Z Erasmus, Nicolas Birmurske, Reinhard

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